Paper cutting machine



Aug. 1, 1933.

K. sfrEGMANN PAPER CUTTING MACHINE Filed Jan. 13. 1930 2 Sheets-Sheet l @Bf www@ Aug. 1, 1933. K. STEGMANN 1,920,718

PAPER CUTTING MACHINE Filed Jan. 13. 1930 2 Sheets-Sheet 2 Patented Aug. l, 1933 UNITED STATES PATENT- OFFICE PAPER CUTTING MACHINE Application January 13, 1930, Serial No. 420,574, and in Germany May 29, 1929 9Claims.

This invention has reference to improvements in cutting, trimming or clipping machines for paper, card board and the like and particularly to the cutting and trimming of printing sheets and it is intended among other important objects to devise novel means of performing strictly rectangular cuts, and to generally facilitate and improve the manipulation and manufacture of devices of the kind referred to. The exactness of the rectangular relation of the sides of the pile of printing paper is an absolute` necessity for smooth and uninterrupted accomplishing of the printing operation, and great care has therefore to be devoted to the cutting operation. In the paper mills the cut has usually been performed heretofore for the sake of economy on very high piles by means of so-called plane cutters, inasmuch as these instrumentalities al low of a very easy manipulation of the piles which usually weigh about 100 to 200 pounds.

With these plane cutters it is impossible, however, to obtain a rectangular cut or trimming, so that the sheets, as they come from the paper mills, have to be trimmed over again by additional cutting machines in the printing establishments. This additional work and the waste of time and labor connected therewith are a very serious drawback. Now, in accordance with this invention hereinafter to be described it becomes possible to cut and trim the large piles on cutting machines in the very same simple manner, as usually performed by means of plane cutters, by providing the cutting table with a plate which carries the pile and, being supported by rollers, is displaceable in every direction, so that the pile may easily be turned and reversed. The rollers, casters or the like, are preferably spring-actingly connected with the plate in such a manner that they are adapted to withdraw to the rear of the lower edge of the plate and allow of the plate becoming fixedly and completely supported on the table during the cutting operation. An exemplication of the principles of the invention is shown on the accompanying drawings as embodied in a cutting machine table provided with the device of this invention in Figure 1 in plan view, in Figure 2 in sectional view on the line II-II of Figure 1, and in Figure 3 partly in section and in side elevation.

Upon the table 4 of the cutting machine a plate l1 is arranged which is movable upon said table, being supported by rollers A, so that the plate 1 is displaceable in every direction. Upon the plate 1 the pile 2 is supported which is indicated in the drawings by marginal shading. The plate 1 'has exactly rectangularly disposed edges, so that its correct and proper position may be accurately obtained by placing it snugly against the so-called saddle plate of the cutting machine. Thus, in order to produce an exactly rectangular cut, it is merely necessary to place the pile in the usual straightened condition upon the plate.

vFor the cutting and trimming of square sizes the saddle plate of the machine may be fixed in a certain position, while in the case of rectangular sizes it should only be adjusted between two end positions.

The pile 2 is brought by means of the plate 1 under the knife 14 which is moved up and down by mechanism not shown and severs or separates during its downward movement the parts of the pile 2 which project over the path of the knife. Prior to the cutting operation, the pile is pressed together by a press beam in order to obtain a 75 good cut.

The rollers A are spring-actingly mounted on or in the plate, and during the cutting operation these rollers yield suiiiciently to allow of the plate 1 resting upon the cutting machine table. The plate 1 will then be spaced about 4 hundredths of an inch (one millimeter) from the cutting machine table, so that this lowering movement of the plate does not interfere with the exactness of the cut. The rollers A, as more clearly shown in Figure 2 of the drawings, are disposed in a recess 5 oi the plate 1. In this cavity or recess is a spring-acting gasket or washer disc 6 supporting the axial ball bearing 7. In the lower annular ball race of said bearing a ball-carrier 8 with a ball 9 is secured in such a manner that the ball 9 is eccentrically disposed in the roller carrier 8. By means of this eccentric arrangement of the ball or roller 9 it will be self-adjustingly retained in position irrespective of the direction of movement and without undergoing any appreciable friction.

The several rollers or balls are distributed on the plate 1 in such a manner that the bending of the comparatively thin plate 1 under the weight of the pile does not exceed one half of a millimeter (about two hundredths of an inch), so as to exclude the possibility of contact of the straightening plate with the table of the cutting machine, when the pile is positioned.

After the iirst and second cuts stops 3 may be secured to the cutting surfaces by screwing or otherwise, soas to protect the pile from displacement during the turning around of the pile and thereby to exclude the possibility of incorrect or 110 uneven cuts which are for instance liable to occur in the case of plane cutters by the action of such stops upon the plate as a result of the play or dead motion within the guides of the plate.

The turning of the plate 1 is indicated in Figure 1 by broken lines.

It should, of course, be understood that the invention is not restricted to the particular embodiment herein shown and described by way of exemplication, but it is capable of other modifications and changes in accordance with varying conditions of application and the convenience of the operator, and within the scope of the appended claims.

I claim:-

1. In a device of the kind described in combination, a cutting machine table, a plate arranged above the table, means yieldingly mounted on the undersurface of the plate and engaging the table so that the plate is freely displaceable in any desired direction on the table.

2. In a device of the kind described in combination, a cutting machine table, a pile-supporting plate arranged above said table, and antifriction members yieldingly mounted in the undersurface of the plate and admitting of free movement of the plate on the table in various directions.

3. In a device of the kind described a cutting machine table, a rectangular comparatively thin l' pile-supporting plate anti-friction means in the form of rollers yieldingly mounted in the undersurface of the plate and rotatable on axes both vertically and horizontally of the plate and adapted to keep the plate slightly spaced from the table and out of contact therewith, and admitting of free movement of the plate on the table in' various directions'.

4. In a device of the kind described in combination, a cutting machine table, a movable the table, vertically yielding rollers mounted in the undersurface of the plate for keeping itat a varying, small distance from the table and admitting of free movement of the plate in various directions on the table.

5. In a device of the kind described in combination, a cutting'machine table, a rectangular pile-supporting plate arranged above the table, yieldingly supported carrying rollers for saidv plate and pile-locating stops adjustably disposed on said plate.

6., In a device of the character described in combination, a cutting machine table, a movable rectangular .pile-supportingl plate, axially disposed ball-bearing means mounted on the lower side of the plate, supporting rollers on said means engaging the table, and spring-actingly disposed retaining means on the plate for the ball-bearing '7. In a device of the kind described in combination, a cutting machine table, a downwardly recessed, horizontally movable, pile-supporting plate, comprising a bottom portion with downwardly open cavity, an annular axial ball-bearing in said cavity, ball races on said bearing and 10g) a supporting roller, eccentrically mounted in said bearing.

8. In a device of the kind described in combination, a cutting machine table, a downwardly recessed, horizontally movable, pile-supporting 135 plate comprising a plurality of recessed, downwardly open bottom portions, ball-bearings, yieldingly supported in said recessed bottom portions, and supporting rollers, rotatably retained in said ball bearings and engageable with the table.

9. A device as claimed in claim 3, wherein a ball bearing is provided for receiving each roller and permits of the roller being rotated about an axis vertical to the plate.

KARL STEGMANN. 

